I liked the Samsung keyboard the most initially but giving swype half a chance changed all that, one hand swyping is faster and about as accurate as the other keyboards. they all take some practice and IMO it is better to practice on swype as you will get better results in the long run. Only thing is I wish it had some features of the other keyboards, and I don't like the pop-up word suggestion design.
I am trying the SwiftKey beta right now though and really liking that a lot, it is crazy accurate and somehow easier to fix things than the other keyboards. I am trying to NOT hit the right keys and it still figures out what I'm writing, so this may be a good alternative too.